Kid at work was telling me how she was having a little drink in a local pub when the publican announced a free beer for everyone who helped him build an oven.
Apparently it was constucted fro red bricks cut in half and assembled with lime and cement mortar. The floor is red brick on a steel tray.
It was all done and dusted in a weekend.
I asked if it worked OK and my informant said, "it works great, it cooks a pizza in 15 minutes".
A little hard to see in the photo I just shot over the beer garden fence with the wife's phone, but the unbraced corners sag a bit, and there is clearly no insulation, and I swear I could see daylight through a couple of the mortar joints.

I do not know the foundation details or soil conditions, but following is a simple technique that is unlikly to cause damage.

If it starts to lean too much you can try to stabilize or even right the oven by placing a large amount of weight on the ground on the "up hill" side. By "large amount" I suggest something of the order of 500 or more lbs.

This may take some time, but will eventually compress the soil on that side and start righting the oven.

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